Star light deflection near the sun of 1.75 arcseconds during a solar eclipse has been attributed to post-Newtonian physics for over a century; however, this can alternatively be shown as a geometric resultant of the Sun-Galaxy interface very near the Sun, and specifically conforming exactly to the curvature of the Sun’s orbit in the galaxy. It is clearly demonstrable through basic geometry that the post-Newtonian light deflection is simply due to the Sun-Milky Way Galaxy EquiPotential (EP) interface, and that a simple ratio exists to explain the galactic origin of the deflection effect. This report examines data and reviews solar eclipse deflection tests for their geometry as evidence for this alternative explanation, which we now add as a component model to Diffusion Gravity(DG) theory; moreover, we present a corresponding mechanism for deflection of light near the Sun due to virtual particle behaviors for photons. This effect of gravitational equipotential surfaces on the propagation of light occurs at the interface between gravitational scale regimes, i.e., the Sun-Galaxy interface where virtual particle (VP) streams from the Sun and galaxy form a boundary interface depletion zone, where a proportional diffusion “pressure” causes the attraction of the masses toward the depleted zone, while also manifesting light deflection-refraction effects near the Sun.